Show HN is a Hacker News post format for something you made that readers can try immediately. The title is prefixed Show HN: and the post goes into its own feed alongside the main front page.
It exists because HN's normal front page rewards links to things worth reading. Show HN carves out a place for things worth using, submitted by the person who made them.
Why it matters to a solo founder
It is one of the few remaining places where someone with no audience gets a technical readership on the strength of the work alone. There is no follower graph to accumulate first. You post, and the first few dozen voters decide.
The bar for entry is low and the bar for approval is brutal, which is exactly what makes the feedback worth having.
What actually qualifies
HN's own guidelines are narrower than most people assume. Show HN is for something people can play with. That rules out:
- a landing page
- a waitlist
- a demo video
- a blog post about what you're building
- a funding announcement
If the reader cannot do something in the next sixty seconds, it isn't a Show HN. Posting a waitlist as one is the single most common way a launch gets flagged, and it costs the account credibility that takes months to rebuild.
What goes wrong
Editorializing the title. HN punishes adjectives harder than almost any other community. "Show HN: A revolutionary AI-powered platform" is dead on arrival. "Show HN: A tool that diffs two OpenAPI specs" is not.
Asking people to upvote. Voting rings are detected, and the penalty falls on the submission and the account.
Treating it as a launch and leaving. The comments are the event. A founder who answers every critical reply — including the rude ones — routinely outperforms a better product whose author never showed up.
Posting it twice in a week. Reposting a story that didn't get traction is tolerated once, after a long gap. Repeatedly is not.
The honest limit
Show HN sends a sharp spike of technical, skeptical, mostly non-paying traffic that is largely gone within forty-eight hours. It is very good at telling you whether the idea survives contact with people who build things for a living. It is not a customer acquisition channel, and planning revenue around it is how founders end up disappointed by a post that went well.
Treat it as the cheapest product review you will ever get, and the numbers stop being the point.